以下是我的自定义函数代码:package com.fr.function;import java.net.URL;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.IOException;import com.fr.script.AbstractFunction;public class webget extends AbstractFunction {public Object run(Object args) {URL url = new URL(args.toString());BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));String Line="";while((Line=reader.readLine()) != null){Line += Line;}reader.close();return Line; }}下面这个代码能编译通过,但是无返回值:package com.fr.function;import java.net.URL;import java.io.BufferedReader;import java.io.InputStreamReader;import com.fr.script.AbstractFunction;public class webget extends AbstractFunction { public Object run(Object args) { try { URL url = new URL("http://www.baidu.com"); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String Line=""; while((Line=reader.readLine()) != null){ Line += Line; } reader.close(); return Line; } catch(Exception e){ return e.getMessage(); } }}